The Irish believe that some things can make good things happen, and they call this "luck." They think these things can bring luck:
Four-Leaf Clover: A special clover with four leaves is lucky.
Horseshoe: A horseshoe hung above a door can protect against bad things and bring good luck.
Shamrock: Wearing a shamrock on St. Patrick's Day can bring good luck.
Claddagh Ring: A special ring can show love and loyalty.
Celtic Knots: Special designs with knots can bring good luck and protection.
But remember, luck means different things to different people, and these things are just symbols of good fortune, not promises.